Definition of Trendline
A diagonal line drawn on a chart connecting two or more price points (swing lows in an uptrend, swing highs in a downtrend). Trendlines visualize trend direction and can act as dynamic support or resistance.
At a glance
Term
Trendline
URL slug
trendline
Category
Analysis
Short answer
A diagonal line drawn on a chart connecting two or more price points (swing lows in an uptrend, swing highs in a downtrend).
Deep dives
Full A–Z glossary
Example
Apply the definition: restate “Trendline” in one sentence tied to your next trade (symbol, direction, size, stop). If you cannot, re-read the definition above.
Common mistake
Common mistake: using “Trendline” as loose slang while your broker/platform specification defines it more narrowly.
Professional tip
Tip: bookmark this “Trendline” page and reopen it when reading broker specs so definitions stay consistent.
Practice tools:
Related terms
FAQ
A diagonal line drawn on a chart connecting two or more price points (swing lows in an uptrend, swing highs in a downtrend).
Knowing the precise definition of “Trendline” prevents platform and broker-spec mistakes—a common source of size and cost errors.
Common mistake: using “Trendline” as loose slang while your broker/platform specification defines it more narrowly.