to be on firm ground
be
bi
bi
on
ɒn
on
<abbr style="text-decoration: underline;" title="firm / solid" >firm</abbr>
sɒlɪd
solid
ground
graʊnd
grawnd

英語での「be on firm ground」の定義と意味

to be on firm ground
01

to be in a strong position in an argument due to having all the facts 

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