Drop

drop a line

Meaning: send a brief letter.

Example: If you've got a few minutes to spare, you could always drop her a line. Read on

drop by

Meaning: an informal visit

Example: I hope to finish the dress before Saturday. If you want to see what it looks like you should drop by over the weekend. Read on

at the drop of a dime

Meaning: something that can happen very fast without hesitation

Example: The play can begin at the drop of a dime, you just need to say the word. Read on

drop like flies

Meaning: many people falling ill or dying around the same time

Example: It was flu season and people in our office were dropping like flies. Read on

drop a bombshell

Meaning: make an unexpected, startling or disturbing announcement

Example: My sister dropped a bombshell by announcing she was discontinuing her study for a job. Read on

a drop in the ocean

Meaning: a very tiny part of something big

Example: Her cry was only a single drop in the ocean compared to the billions of tears shed by mourners after the war. Read on

at the drop of a hat

Meaning: at the slightest signal

Example: We now have a situation where laws are bent at the drop of a hat. Read on