Question

Read the excerpt from Act II of Hamlet.

Hamlet: Slanders, sir: for the satirical rogue says here that old men have grey beards, that their faces are wrinkled, their eyes purging thick amber and plum-tree gum, and that they have a plentiful lack of wit, together with most weak hams: all which, sir, though I most powerfully and potently believe, yet I hold it not honesty to have it thus set down; for you yourself, sir, should be old as I am, if, like a crab, you could go backward.

Which is a metaphor?

old men have grey beards, that their faces are wrinkled
their eyes purging thick amber and plum-tree gum
all which, sir, though I most powerfully and potently believe
be old as I am, if, like a crab, you could go backward

Answer 1

"their eyes purging thick amber and plum-tree gum."

Explanation: this equates the old men's tears to "amber and plum-tree gum" without using "like" or "as," so it's a metaphor. ("If, like a crab, you could go backward" is a simile because it uses "like.")