knock

Meaning of knock in English

Noun

1. the act of knocking

I heard two knocks on the door.

2. the sound made by this

a loud knock

Verb

1. hit noisily something such as a door in order to inform one’s arrival

knock on[at] the door

2. (cause to) hit against accidentally

knock one's foot against[on] the table ー stub one's toe into the table