Settle

Rhymes with kettle, metal, mettle...

settler: colon, un colonisateur, une colonisatrice
settlement: village founded by settlers
settle a bill: to pay a bill
settle out of court: to come to an agreement without an official decision
settle a dispute: to come to an agreement
settle the score: to get even Revenge is a dish best served cold.
settle up: to pay completely, régler (there is a smartphone payment app called Settle up)
settle down:: calm down
settle down (2): fonder une famille
settle in: s'y installer (pour la nuit, pour l'hiver ou même pour quelques années)
The matter is settled, then: L'affaire est réglée, alors.
unsettling (adj): troubling, perturbing, disconcerting...

Compare to "set"

set sth up: paramétrer qqch, mettre qqch en place

When you set sth down you stop carrying it...

upset so: make so angry or sad
upset sth: knock sth over, mess sth up
upset (adj): angry, mad, overwhelmed (bouleversé), perturbed, sad
upsetting (adj): navrant, bouleversant
set sth down in writing: mettre qqch à l'écrit (pour le rendre officiel)
set boundaries: définir les limites
a set-up (job): a sting operation cf. this review of the movie Setup at IMDB (the internet movie database).

--Are you all set? Do you need any help? In spoken English this can become: y'all set? need any help?
--No thanks, I'm ready. Everything's set, not to worry. It'll be fine.

here set = ready to go