to put on (shoes), to wear (shoes)
Estou atrasada, e você tem que calçar os sapatos.
I'm running late, and you need to put your shoes on.
— Psicose (1960)
I forgot to put on my socks.
Ela tem muitos pares de sapatos, e nunca sabe quais calçar.
She has many pairs of shoes, and she never knows which ones to wear.
Esses sapatos são muito apertados para calçar.
These shoes are too tight to put on.