They have stayed friends through thick and thin.
through thick and thin
idiom B1
Through all (especially grim, rough and difficult) conditions; in all weathers.
Origin
first recorded 14th c. disputed originFrom medieval hunting and travel — 'through thicket and thin wood'; used by Chaucer in The Reeve's Tale (c. 1386).
My partner supported me through thick and thin while I finished my difficult degree.
The loyal soldiers remained by their commander's side through thick and thin, even when the battle seemed completely lost.
- 01
come thick and fast
To arrive rapidly in large groups.
- 02
have a thin time of it
To be in a difficult or precarious situation due to one not having enough money.
- 03
lay it on thick
To exaggerate or overstate a feeling or emotion.
- 04
on thin ice
Dangerously, hazardously, delicately.
- 05
out of thin air
From nowhere or nothing; from a non-existent or unknown source.
- 06
skate on thin ice
To be (or to place oneself) in a risky, potentially dangerous or delicate situation.
- 07
spread oneself thin
To commit oneself to too many projects, so that there is little chance of completing them all satisfactorily.
- 08
thick and thin
Both good and bad times.