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	the oldest trick in the book the old gray mare the old gray mare ain't what she used to be the old guard the (old) heave-ho the Old Lady of Threadneedle Street the old man the old one-two the old one-two (punch) the old pals act the old school the old school tie the old sod the old switcheroo the old woman is plucking her goose the once-over the one and only the one/a ray of hope the/(one's) junk the/(one's) kisser the/(one's) last breath the/(one's) last gasp the/(one's) mother country the/(one's) mother tongue the one that got away