Be sure of one’s facts or secure in one’s position.
More example sentences
- Dealing with the grandson of his benefactor, my father was on firm ground in being able to reciprocate the kindness which had signalled acceptance and belonging.
- As this is the simple truth - that to live is to feel oneself lost - he who accepts it has already begun to find himself, to be on firm ground.
- As our local MP is both a medical practitioner and the Federal Minister for Education, we felt we were on firm ground.
Definition of be on firm ground in:
- The US English dictionary