n.
1.a militant organization of Irish nationalists who used terrorism and guerilla warfare in an effort to drive British forces from Northern Ireland and achieve a united independent Ireland
2.a self-funded retirement plan that allows you to contribute a limited yearly sum toward your retirement
3.belligerence aroused by a real or supposed wrong (personified as one of the deadly sins)
Idiom of the Day
sack out
to go to bed, to go to sleep
I sacked out as soon as I arrived home last evening.