If by dull rhymes our English must be chain'd,
And, like Andromeda, the sonnet sweet
Fetter'd, in spite of painéd loveliness;
Let us find out, if we must be constrain'd,
Sandals more interwoven and complete
To fit the naked foot of Poesy;
Let us inspect the lyre, and weigh the stress
Of every chord, and see what may be gain'd
Until recently, sandals could be custom fitted to the wearer’s foot simply by lengthening or shortening the bindings. Keats suggests a more complete set of bindings to fit the “foot” of Poesy. That word is a pun including both the physical foot of the imagined female and the poetic “foot”.