- 1
A jackhammer is a large, powerful tool you hold with both hands. It does not quietly turn like a small drill. It hits, again and again, very hard and very fast, so it can break concrete, rock, or the surface of a road. Builders bring it out when they must open a pavement or smash an old floor. It is loud, and the whole tool shakes, so workers protect their ears. People also use it as a verb: to jackhammer a road is to break that road up with this tool. Informal talk can stretch it — a headache that jackhammers is a headache that pounds — but the home meaning is the machine.
風鎬、破碎鎚（敲柏油或水泥的那種；不是一般電鑽）
組成jack + hammer: a hammer, in the tool sense, with jack as the other half of the compound.
同家族的字
- hammerthe hitting tool; a jackhammer is a powerful hammer you hold, striking again and again
原始詞典資料9 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
jackhammernoun/ˈd͡ʒækˌhæmɚ/
- 1
A portable percussive power tool that combines a hammer and chisel used to drill or break hard matter, for instance rock or concrete.
- 2
Something that is very strong but also very rigid.
- A new skiercross pro tour is on the docket, as well as freeskiing. Just like racing, both require strong but supple legs rather than jackhammer quads.
jackhammerverb/ˈd͡ʒækˌhæmɚ/
- 1
To use a jackhammer.
- Early the next day a crew came to fix the street. Vernon was out there at once, watching them jackhammer and haul the asphalt […]
- 2
To break (something) using a jackhammer.
- The foundations for the barrier had been jackhammered away; the piles of broken concrete were just left alongside the road.
- In the morning, the street is being jackhammered up.
- 3
To form (something) using a jackhammer.
- Small ledges had been jackhammered at each end of the crater and timbers bolted into them, forming abutments of the bridge that was to come.
- Richmond already spent tax money on an engineering department whose employees parked their trucks in the street, jackhammered holes in the pavement, and repaired storm sewers […]
- 4
To move like a jackhammer.
- […] a bolt of lightning jackhammered across the sky, interrupting his dream.
- When he jackhammered into her, she clutched the bedspread and braced herself for the onslaught.
- 5
To move like a jackhammer.
- […] he lay rigid, his heart jackhammering, telling himself that there was nothing out there, nothing […]
- The paranoia came on pretty damn strong for this early in the morning, his high blood pressure—160 over 90 at twenty-two—jackhammering in his wrists, his thoughts caterwauling beneath the moment.
- 6
To move (something) like a jackhammer.
- He […] drew his knees toward his chest as far as the cramped space would allow, and jackhammered his feet into the forward wall of the trunk, which was formed by the backseat of the car.
- Then, before the lumberjack had a chance to react, Dad grabbed him by the scruff of the neck and jackhammered his head into the bar.
- 7
To strike (something) repeatedly with force, to pound.
- Guam-based B-52 bombers, newly modified to haul 60,000 lbs. of bombs each, jackhammered a Viet Cong radio and communications center 35 miles northeast of Saigon.
- He didn’t make love to her; he jackhammered her.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。