The initial idioms of the letter U

Union is strength	union
unit	unite
unite against	unite for
unite in	unite into
unite with	United we stand, divided we fall
units	universe
unkindest cut	unkind
unk-jay	unknown
unknown quantity	unlax
unleash	unleash against
unleash on	unlikely
unload	unload from
unload on	unobtanium
uno	unpunished
unquote	unreal