1. point; tip; end; nozzle
恥ずかしいのか、彼女の形の良い耳の先が赤く染まっている。Perhaps out of embarrassment, the tips of her well-shaped ears are tinged red.
2. head (of a line); front
列の先まで行ってみよう。Let's go up to the front of the line.
3. first; before; ahead (of)
おい、私より先を走るな！Hey, don't run ahead of me!
4. (the way) ahead; beyond
ここから先はもっと道が酷くなります。The road gets worse from here on.
5. future
先のことまでは分からないけれど。I can't tell what the future holds, though.
6. previous; prior; former; recent; last
彼は先の戦争に参加していた。He had fought in the last war.
7. destination; address; place where you do something
これから向かう先でだってなにがあるかわからないのに。We don't even know what's waiting for us where we're headed, and yet...
8. rest (e.g. of a story); continuation; remaining part
そこから先は覚えてない。I don't remember anything after that.
9. the other party