トムは口髭を伸ばしている。

to be rich; to become rich; to be abundant (with); to abound (with); to be rich (in)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

moustache; mustache

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to grow long (e.g. hair, nails); to lengthen; to extend; to stretch; to reach out; to hold out; to straighten; to smooth out; to spread evenly (dough, cream, etc.); to dilute; to thin out; to postpone; to prolong; to strengthen; to develop; to expand