great speed in doing something, especially because you do not have enough time [= hurry]:
I soon regretted my haste.
in your haste to do something
In his haste to leave, he forgot his briefcase.
2 written or formal
quickly or in a hurry:
They left in haste, without even saying goodbye.
3 old use
to hurry or do something quickly
4 British English haste makes waste American English
used to say that it is better to do something slowly, because if you do it too quickly you will make mistakes