Very busy, informally Crossword Clue

 The answer to the crossword clue "Very busy, informally" is SNOWED UNDER.

This informal expression is used to describe someone who is overwhelmed with work or other commitments. They may be so busy that they feel like they are buried under a pile of snow.

Other informal expressions that mean "very busy" include:

Tied up

Swamped

Overwhelmed

Overbooked

Flat out

Bouncing off the walls

The formal word for "very busy" is occupied. This word can be used in both informal and formal contexts.

For example, you might say to a friend, "I'm so snowed under with work right now, I can barely think straight." Or, you might say to your boss, "I'm afraid I'm a bit occupied at the moment, but I'll get back to you as soon as I can."

I hope this helps!