on the boil

prep_phrase
RareNot in standard dictionaries
1

simmering strongly and about to boil.

2

About to happen; imminent.

3

boiling.

4

continuing; active; in a state of activity or development.

5

Going smoothly; working well.

6

Playing exceptionally well.

7

(Of a player taking a pass) running at full speed towards the opposition.

#colloquial