“以胸对着”可以翻译为 “face (someone/something) with one's chest” 或者更简洁自然地表达为 “stand facing (someone/something) with the chest forward” ，不过在日常表达中，根据具体语境，也可能会用 “confront (someone/something) chest - on” 这类表述 。例如：
He stood facing the enemy with his chest forward, showing no fear.（他以胸对着敌人站立，毫无惧色。）
The boxer confronted his opponent chest - on in the ring.（拳击手在拳击场上以胸对着对手。）