Concept:
A synonym is a word that has the same or nearly the same meaning as another word.
The word zigzag refers to:
• Moving with many turns
• Not following a straight line
• Having an irregular or winding course
Common synonyms include:
\[
\text{Winding, Twisting, Crooked, Oblique}
\]
Step 1: Examine option (a) Oblique.
The word oblique means:
• Slanting
• Inclined
• Not straight or direct
Since a zigzag path is not straight, oblique is similar in meaning.
Therefore,
\[
\boxed{(a)\ \text{is correct}}
\]
Step 2: Examine option (b) Winding.
The word winding means:
• Twisting
• Following a curved course
• Turning repeatedly
This closely resembles a zigzag movement.
Hence,
\[
\boxed{(b)\ \text{is correct}}
\]
Step 3: Examine option (c) Straight.
A zigzag path contains many turns.
A straight path contains no turns.
Thus the meanings are opposite.
Therefore,
\[
\boxed{(c)\ \text{is incorrect}}
\]
Step 4: Examine option (d) Direct.
Direct means:
• Straightforward
• Without deviation
• Following the shortest path
This is opposite to zigzag.
Therefore,
\[
\boxed{(d)\ \text{is incorrect}}
\]
Step 5: Choose the correct answer.
The words similar in meaning to zigzag are:
\[
(a)\ \text{Oblique}
\]
and
\[
(b)\ \text{Winding}
\]
Hence,
\[
\boxed{\text{Option (D)}}
\]
is the correct answer.