It means your a noob.

it meansnoun
1.
the refreshing quiet or repose of sleep: a good night's rest.
2.
refreshing ease or inactivity after exertion or labor: to allow an hour for rest.
3.
relief or freedom, especially from anything that wearies, troubles, or disturbs.
4.
a period or interval of inactivity, repose, solitude, or tranquillity: to go away for a rest.
5.
mental or spiritual calm; tranquillity.
6.
the repose of death: eternal rest.
7.
cessation or absence of motion: to bring a machine to rest.
8.
Music .
a.
an interval of silence between tones.
b.
a mark or sign indicating it.
9.
Prosody . a short pause within a line; caesura.
10.
a place that provides shelter or lodging for travelers, as an inn.
11.
any stopping or resting place: a roadside rest for weary hikers.
12.
a piece or thing for something to rest on: a hand rest.
13.
a supporting device; support.
14.
Billiards, Pool . bridge1 ( def. 14 ) .

it means everything that you have gets taken away and your level put back to 1 no prestige. that includes combat training

Means your stats are reset

FAILLLLLLLL

WAKE UP!

ZEH MEGA N00000B