Also means
to reassure
Usage Note
Tranquilliser means to calm someone's fears or agitation; se tranquilliser is the reflexive form meaning 'to calm down.' A tranquillisant (m) is a tranquilliser (medication). It is a regular -er verb and somewhat more formal than the everyday calmer.
Examples
"Rien ne pouvait le tranquilliser."
Natural Translation
Nothing could calm him.
Literal Translation
Nothing not could him calm.
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