勇 (yǒng) is a bound morpheme, meaning it cannot stand alone as an independent word in modern Mandarin. Its core meaning is 'brave' or 'courageous', and it commonly appears as the first element of compound words like 勇敢 (brave), 勇气 (courage), and 勇士 (warrior). In historical or military contexts, it also contributes to compounds meaning 'soldier' or 'conscript', such as 兵勇, but this usage is less frequent in everyday speech. Because it is a bound form, you will always encounter 勇 inside a longer word.