несовер.
без доп.
1) grow heavy
become heavier, increase in weight (прибавлять в весе)
put on weight, gain weight, grow stout (толстеть)
2) become heavy with sleep (о глазах, веках)
несов. grow* heavy
(о частях тела, голове тж.) begin* to feet heavy
(о глазах) become* heavy with sleep