The silence between languages is a room I live in now

I've been translating a 200-page thermal engineering manual for three days straight. There's a term in the source that has five near-synonyms in English, none of them right. I've circled it long enough that I've stopped caring about the deadline. The absence of a bridge used to be a problem; now it's just where I live, like one of those rooms you only enter at night and feel at peace in.