Ayns un 'ockle ynrican. In one word only.
Cha nel shin aeg agh yn un cheayrt. We are only young once.
Cha vaik mee eh agh yn un cheayrt shen. I only saw him that once.
Dy scarrey un chorneil jeh'n vagher lesh faal. To fence off one corner of a field.
Dy ve currit stiagh ec yn un cheayrt. To run concurrently.
Ec yn un cheayrt. All at one go.
Etlan un hoiag. Single seater.
Haink mee ass agh daag mee un hooill my yei. I got out of it minus one eye.
N'abbyr un 'ockle jeh. Don't breathe a word of it.
Ren eh lhieggey eh lesh un builley. He dropped him with a blow. *
She'n un vollagh ta faagit. It's the only avenue left.
T'ad yn un chooid. They are one and the same.
T'ee shiast er un sheeiney. She's dry on one teat. *
T'eh un vlein jeig d'eash. He is eleven.
Ta daa pherick jannoo un ghimmagh. Two immature lobsters equal one lobster.
Ta enn aym er un Chaptan Crebbin. I know a Captain Crebbin.
Ta shen y clane skeeal ayns un 'ockle. That's the whole thing in a nutshell.
Ta shin ooilley 'syn un vucklagh. We are all in the same boat.
Ta un cheyrrey screbbagh doghaney yn clane shioltane. One scabby sheep infects the whole flock.
Ta'n clag goll er oaie un vinnid gagh laa. The clock gains a minute every day.
Va'n jees oc er un cheim 'sy chied voayl. They both tied for first place.
Vroo ad un veer stiagh 'sy veer elley. They forced one piece into the other.

un does not affect words beginning with t, d, çh, j.

As un teiy ny lomarcan noi. With one dissentient vote.
Cha jinnin cur mee hene er yn un keim as eshyn. I wouldn't descend to his level.*
Cha ren ee keayney un jeir. She did not shed a tear.
Er yn un çheu t'eh kiart er y çheu elley cha nel eh. On the one hand it's O.K. on the other it's not.
Hie ad dys yn un çheu. They became allies.
Hie yn chionnal gys un çheu. The crowd drew to one side.
Huitt yn daa haglym ec yn un traa. The two meetings clashed.
Lesh un sluggag. At one gulp.
Lhie y baatey er un çheu. The boat took a list.
Lhiennoo jeh'n un çhennar. Twins of the one birth.
Slug eh lesh un sluggey jeh. He swallowed it whole. *
T'ad cummal 'syn un thie. They live in the same house.
Ta mee cur my chiartys gys un çheu. I divest myself of the right.
Ta'n eaddagh eck jeh'n un daah. Her clothes are very plain.
Yeeall y lhiggey magh un towl. Let a strap out one hole.
Yn un dooinney jeig. The eleven men.
Yn un shooyl. The one fate.*
Yn un thie. The same house.