verb

1. To allow to, not to prevent (+ infinitive, but usually without to).

   “After he knocked for hours, I decided to let him come in.”

2. To leave.

   “Let me alone!”

3. To allow the release of (a fluid).

   “The physicians let about a pint of his blood, but to no avail.”

Synonyms: allow, permit

verb

1. To hinder, prevent, impede, hamper, cumber; to obstruct (someone or something).

2. To prevent someone from doing something; also to prevent something from happening.

3. To tarry or delay.