wei3
means 'tail'
wei3
can be seen to have the components
where the first denotes 'lower part of the body' and the second is the
character mao meaning 'hair'. By extension it also means
'the remaining part'.
ma3wei3 means 'horse tail'
ma3
in its original script is
which is a clear graphical representation of a horse with long flowing
mane.
wei3zhui1 means 'hot on the trail
of' and literally translates as 'tail'-'chase'.
zhui1
has two components
.
The first component means 'distance' and the second component denotes 'a
mound'. Curiously, although its modern meaning is 'chase', it originally
meant 'to follow' i.e. 'up the mound in the distance'.