Here's what rhymes with undergrew.
you grew que u crew q clue cue glue lieu queue accrue cu lu rue loo yew yu ewe ru clew roux to who do two new through too few true view due knew blue drew du threw blew coup flew qu screw shoe zu dew hue shew su sue tu vous chew deux flue fu slew zoo brew bu flu hu ju jus ku mu nu peu pew pu seu shu skew sou thru vu woo boo chou chu coo cou doo feu fue gu hew mieux shou shrew thu tue vou vue wou wu askew goo mew moo pooh poo shoo gnu slue thew whew phew regrew interview pursue anew bamboo canoe renew undue debut stew taboo undo untrue adieu ado piu tattoo sprue tzu outgrew redo strew halloo spew valuer kazoo superglue overgrew achoo into review overview ensue subdue caribou jusqu overthrew barbecue beaucoup eschew outdo revue shampoo sinew vnto imbue barbeque bugaboo endue fondue foreknew zebu indue peekaboo bestrew buckaroo muumuu overflew prevue overdrew wazoo booboo atishoo revenue residue withdrew avenue rendezvous retinue construe overdue kangaroo overdo ballyhoo cockatoo hullabaloo marabou overshoe hitherto honeydew misconstrue