We can identify the meaning of each prefix and write a word using them in the following manner:
1. Out: can refer to something that is external, or to something that is more, exceeding something else.
Example: outperform.
2. De: indicates removal of something; "down", "away", or "off".
Example: devalue.
3. Pre: means "before" or "prior to".
Example: precondition
4. Under: means "below", "less", or "lower"; indicates that something is not enough.
Example: understate.
A prefix is a group of letters placed at the beginning of a word. It modifies that word's meaning.
Many prefixes in the English language actually come from Latin or Greek roots.
By adding a prefix, we transform a word into another word, and convey a different meaning.
Examples: value - devalue; think - overthink; like - dislike; red - infrared.
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