Alternative form of you can't put the toothpaste back in the tube

Once something is said or done, it cannot be unsaid or undone.

present participle of put one's money where one's mouth is

simple past tense and past participle of put one's money where one's mouth is

Third-person singular simple present indicative form of pick up what someone is putting down

simple past tense and past participle of pick up what someone is putting down

(idiomatic) Alternative form of put one's foot in someone's ass.

Do not dedicate all your resources to one project. / Do not count on any one thing to safeguard what is valuable.

Alternative form of you can't put an old head on young shoulders

Young people inevitably lack the experience and wisdom which come with age.