be (as) solid as a rock
to be very strong:
I always thought their marriage was solid as a rock.
Thesaurus: synonyms and related words
Power and intensity
- ascendant
- beef
- brunt
- cast iron
- clout
- depth
- durable
- intensity
- invincible
- invulnerable
- kick-ass
- mother
- pack
- richness
- robust
- strength
- the mother of all sth idiom
- tough
- vehement
- vigour
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