[knock] See: [SCHOOL OF HARD KNOCKS].

[knock about] or [knock around] {v.} To travel without a plan; […]

[knock back on one's heels] See: [SET BACK ON ONE'S HEELS].

[knock cold] {v. phr.}, {informal} To render unconscious. * /The blow […]

[knock down] {v. phr.} To reduce; lower. * /The realtors said […]

[knock for a loop] or [throw for a loop] {v. phr.}, […]

[knock it off] {v. phr.}, {slang}, {informal} 1. To stop talking […]

[knock off] {v. phr.}, {slang} 1. To burglarize someone. * /They […]

[knock off one's feet] {v. phr.} To surprise (someone) so much […]

[knock on wood] {v. phr.} To knock on something made of […]