BIGfoot
The word is be. Placed in front of low it spells below.
One or more syllables placed in front of a base or root word is called a prefix.
When a plane mirror is placed in front of a word, the word's image appears reversed from left to right. This is because the mirror flips the word's orientation along its vertical axis.
foot
day
There is no English word with the pattern ?blip.
day
Suffix is placed behind the base word.
con-sign
con + sign = consign
post
pro, con