rap on (something)

To strike something with one or more quick, light blows, as when getting someone's attention; to knock or tap at something swiftly and lightly. I thought I heard someone rapping on my window in the middle of the night, so I was wide awake with fear until morning! The wind was causing a tree branch to rap on the door in a most unsettling manner.

词组	rap on (something)
释义	rap on (something) rap on (something) To strike something with one or more quick, light blows, as when getting someone's attention; to knock or tap at something swiftly and lightly. I thought I heard someone rapping on my window in the middle of the night, so I was wide awake with fear until morning! The wind was causing a tree branch to rap on the door in a most unsettling manner. See also: on, rap Farlex Dictionary of Idioms. See also: a slew of (something) (one) could use (something) (I) wouldn't (do something) if I were you (one) never would have guessed (one) doesn't give a rip (about something) all right (one) doesn't give a hoot (about something) a/the feel of (something) (one) won't hear of (something) a straw will show which way the wind blows
随便看	tight as the bark on a tree tighten tighten belt tighten on tighten one's belt tighten (one's) belt tighten one's belt, to tighten one’s belt tighten (something) on (something else) tighten (something) onto (something else) tighten the purse strings tighten the reins tighten the screw tighten the screws tighten the screw(s) (on one) tighten the screws on (one) tighten up tighten your belt tighter than Dick's hatband tightfisted tight-lipped tight money tight race tight rein on, a tightrope