拦挡 (lán dǎng) is a compound verb meaning 'to block and deflect' — it implies actively intercepting something moving toward you and redirecting its path or force. The first character 拦 (lán) means 'to bar', 'to intercept', or 'to obstruct', often with physical movement, while 挡 (dǎng) means 'to block', 'to shield', or 'to resist'. Together, they emphasize both stopping and diverting an oncoming object or action, not just passive obstruction. This word suggests dynamic, deliberate intervention.

It’s commonly used in contexts involving animals, sports, or security — for example, when herding livestock, defending in martial arts or ball games, or controlling crowds. It carries a sense of controlled resistance rather than complete stoppage; the emphasis is on redirection as much as blocking. Though occasionally used metaphorically (e.g., '拦挡谣言'), its most frequent and natural usage remains physical and action-oriented, especially where motion and quick response are involved.