Is “Slowing” a Scrabble word?
Yes
SLOWING
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Slowing
verb
1.To make (something) run, move, etc. less quickly; to reduce the speed of.
2.To keep from going quickly; to hinder the progress of.
3.To become slow; to slacken in speed; to decelerate.
Synonyms: decelerate, slacken, delay, hinder, retard
noun
1.A deceleration; a slowing down.