fan, flap, instigate, agitate, bolster up, gulp down
煽 centers on stirring up air or emotion: fanning a flame, flapping wings, or agitating people into action. The sense of gulping down is a natural extension of fanning something inward rapidly.
煽 combines 火 (fire) with 扇 (fan), suggesting fanning a fire to stir it up. The extended meanings of agitating or instigating follow from this image.
Fire 火 on the left and a fan 扇 on the right: picture fanning flames to make them roar, or fanning emotions to stir people up.
For セン, imagine a sen (千, thousand) fans flapping at once, whipping up a huge fire: 千 -> セン, and the air is full of agitation.
to fan (oneself, flames, etc.)
gust (of wind); blast
instigation; flattery
it's dangerous to fall for flattery
to flatter; to soft-soap; to sweet talk; to cajole; to instigate
to suffer a blast or indirect blow; to be subject to the surplus force of an impetus
doorstop
to flap strongly; to stir up fiercely
inflammatory (news) article; inflammatory fake news
scissors kick (swimming)