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3 N‑COUNT A bolt on a door or window is a metal bar that you can slide across in order to fasten the door or window. □  I heard the sound of a bolt being slowly and reluctantly slid open.

4 VERB When you bolt a door or window, you slide the bolt across to fasten it. □ [V n] He reminded her that he would have to lock and bolt the kitchen door after her. □ [V -ed] …the heavy bolted doors .

5 VERB If a person or animal bolts , they suddenly start to run very fast, often because something has frightened them. □ [V ] The horse bolted when a gun went off. □ [V prep/adv] I made some excuse and bolted for the exit.

6 VERB If you bolt your food, you eat it so quickly that you hardly chew it or taste it. □ [V n] Being under stress can cause you to miss meals, eat on the move, or bolt your food. ● PHRASAL VERB Bolt down means the same as bolt . □ [V P n] Back then I could bolt down three or four burgers and a pile of French fries. [Also V n P ]

7 N‑COUNT A bolt of lightning is a flash of lightning that is seen as a white line in the sky. □ [+ of ] Suddenly a bolt of lightning crackled through the sky.

8 PHRASE If someone is sitting or standing bolt upright , they are sitting or standing very straight. □  When I pushed his door open, Trevor was sitting bolt upright in bed.

9nuts and bolts → see nut

▸  bolt down → see bolt 6

bo lt-hole (bolt-holes ) also bolthole N‑COUNT If you say that someone has a bolt-hole to go to, you mean that there is somewhere that they can go when they want to get away from people that they know. [BRIT ] □  The hotel is an ideal bolt-hole for Londoners.

bo lt-on ADJ [ADJ n] Bolt-on buys are purchases of other companies that a company makes in order to add them to its existing business. [BUSINESS ] □  Mr Hand said the company would make further bolt-on acquisitions in the U.S…

bomb ◆◆◇ /bɒ m/ (bombs , bombing , bombed )

1 N‑COUNT A bomb is a device which explodes and damages or destroys a large area. □  Bombs went off at two London train stations. □  It's not known who planted the bomb. □  Most of the bombs fell in the south. □  There were two bomb explosions in the city overnight.

2 N‑SING Nuclear weapons are sometimes referred to as the bomb . □  They are generally thought to have the bomb.

3 VERB When people bomb a place, they attack it with bombs. □ [V n] Airforce jets bombed the airport. ●  bomb|ing (bombings ) N‑VAR □ [+ of ] Aerial bombing of rebel positions is continuing. □  There has been a series of car bombings.

4 → see also petrol bomb , pipe bomb

▸  bomb out

1 PHRASAL VERB If a building or area is bombed out , it is destroyed by bombs. If people are bombed out , their houses are destroyed by bombs. □ [be V -ed P ] London had been bombed out.

2 → see also bombed-out SYNONYMS bomb NOUN 1

explosive:There were traces of explosives in the bedroom.

mine:He stepped on an unexploded mine.

missile:…nuclear missiles.

grenade:A hand grenade was thrown at an army patrol.

bom|bard /bɒ mbɑː ^r d/ (bombards , bombarding , bombarded )

1 VERB If you bombard someone with something, you make them face a great deal of it. For example, if you bombard them with questions or criticism, you keep asking them a lot of questions or you keep criticizing them. □ [V n + with ] He bombarded Catherine with questions to which he should have known the answers. □ [be V -ed + by ] I've been bombarded by the press and television since I came back from Norway.