allatonce

adverb

UK /ˌɔːl ət ˈwʌns/

US /ˌɔːl ət ˈwʌns/

Doing everything at the same time.

The kids shouted allatonce when the clown appeared.

SYNONYMS

simultaneously together at the same time in unison

RELATED WORDS

suddenly immediately together at once

OTHER MEANINGS

2. Happening very suddenly and without warning.

Allatonce the lights went out.

3. All at the same moment rather than one by one.

Please don't talk allatonce.

4. Doing many things at the same time in a rushed way.

She tried to clean and cook allatonce.