en_tn_lite_do_not_use/exo/10/20.md

Yahweh hardened Pharaoh's heart

Here "heart" refers to Pharaoh. His stubborn attitude is spoken of as if his heart was hard. See how you translated this phrase in Exodus 9:12. AT: "caused Pharaoh to became more defiant" (See: rc://en/ta/man/translate/figs-synecdoche and rc://en/ta/man/translate/figs-metaphor)