嚆hāo

Ⅰ  [书] （呼叫） cry;yell Ⅱ （构词成分）: ～ 矢 [- shǐ] [书] ❶ （带响声的箭） an arrow with a whistle attached
❷ （比喻事物的开端或先行者） beginning;forerunner;harbinger;precursor
◆嚆矢维艰 The beginning is difficult.

• often
• oil
• okay，OK
• old
• omit
• on
• on
• once
• one
• one
• one
• one
• oneself
• only
• only
• only
• onto(亦on to)
• onwards
• open
• opening
• operate
• operation
• opinion
• opponent
• opportunity