The big seal script of character Meet is
The left is called Walking Radical, meaning walking. The top is half of character Move (Post 96), the bottom one is Foot (Post 93), moving on foot. The right part is character Sharp (Post 510). People meet on the road, most likely narrow road, like road in mountain.
There is another character Meet - 见 (Post 201). What is the difference? 见 is arranged meeting or expected meeting, the character Meet in this post is Meet unexpectedly, the sharp here may mean that surprise, unavoidable, sudden, etc. like a needle inserting, wakes you up.
The small seal script of the character is