to give a person or group of people the right to vote in elections (Cambridge)
to give somebody the right to vote in an election (Oxford)
Women in Britain were first enfranchised in 1918.(Cambridge)
Two mainstream political parties, in Pakistan, strongly favour enfranchising teenagers.
enfranchise somebody
enfranchising teenagers
unshackle
empower
disenfranchise
enslave
enfranchisement
enfranchise