put it mildly

Understate, say without exaggeration, as in It's a fairly long way to walk, to put it mildly-twenty miles or so. [First half of 1900s]

Name	Pronounced	Usage
Mckenzie	[mə'kenzi]
Larrie	LER-ee, LAR-ee	English
Aleksey	ah-lyek-SYAY (Russian), ah-leek-SYAY (Russian)	Russian, Ukrainian, Belarusian
Dimosthenis	-	Greek
Betje	BET-yə	Dutch, Limburgish
Pertti	PERT-tee	Finnish