How to say "Open" in Japanese

When translating "open" into Japanese, you must choose carefully between 開く and 打ち解ける. In Japanese, 開く (あく (aku)) is typically associated with "to open (intransitive)" (Syllabus Level: N4) and represents Intransitive verb. Used when something opens on its own or is opened by an unspecified agent. On the other hand, 打ち解ける (うちとける (uchitokeru)) maps to "to open one's heart, to become friendly, to relax" (Syllabus Level: N2) and represents To become less reserved, more relaxed and informal with someone, moving from a formal or tense state to a more comfortable and open one. Often used with the particle 「に」.. A literal translation of "open" can often sound unnatural to native Japanese speakers if mixed up!