1966, Cheng Man-Ch'ing, Robert Smith. T'ai Chi: The "Supreme Ultimate" Exercise for Health, Sport, and Self-Defenseː
Raise your right hand, palm in, to neck level and stretch it forward, palm down.

2007, Marcia King-Gamble, Down And Out In Flamingo Beachː
"Just look at you. I remember when you were about this big. Knee-high to a grasshopper," he said, holding his hand palm down.

2014, Ken Ludden, Academy Method: Body Mechanics 2-Week Courseː
On COUNTS 1-& 2-& the dancer lifts one arm directly to the side at shoulder level, palm down and reaching with the fingertips, arm fully extended.

Palm down

Meaning

Adv