slow to heat up / (fig.) (of a person) reserved; introverted; slow to develop relationships; (of a product etc) to take time to become popular; (sports) slow to reach peak performance
慢
=
忄
+
曼
:
The fight between Mahatma Gandhi and Nelson Mandela has been very slow, so the audience decided to help them a bit and hands each of them two flails.
to warm up / to heat up / hot (of weather) / heat / fervent
热
=
执
+
灬
:
Robinson Crusoe wants to heat himself up in the elevator's bathroom, so he burns his good-for-nothing grilling license on a grill to ignite a sizeable flame.