Lag: Definition, Usage & Common Mistakes

Meaning 1：fall behind (lag)

lag 🔊

/læɡ/

to be slower or later than others

Illustration of lag meaning: runner falling behind others on a track

fall behind 🔊

➕

/fɔːl bɪˈhaɪnd/

To fail to keep pace with others; to move, progress, or develop more slowly than expected or desired.

📁 Category：Technological Inventions 🔖 Level：Intermediate

📘 Details & Usage

📖 Root Explanation

Likely from Middle English 'laggen', meaning to move slowly, possibly of Scandinavian origin related to Old Norse 'lagga'.

💡 Mnemonic

Think of a 'luggage bag' slowing you down, making you 'lag' behind others.

📖 Example

My internet connection always lags during online class, so the teacher's voice sounds choppy. 🔊 My internet connection always falls behind during online class, so the teacher's voice sounds choppy.

🔗 Collocations

lag behind – to fail to achieve the same level or rate of progress as others

lag time – a delay or period of waiting between one event and a related subsequent event

jet lag – fatigue and disorientation caused by traveling across different time zones

🔄 Synonyms

trail (v.) – to be behind in a race, competition, or comparison

dawdle (v.) – to waste time; to be slow and idle

delay (v.) – to cause to be late or slow

🚫 Antonyms

lead (v.) – to be at the front or in first place

advance (v.) – to move forward or make progress

accelerate (v.) – to increase in speed or rate

🌱 Derivatives

laggard (n.) – a person who makes slow progress and falls behind others

lagging (adj.) – falling behind; not keeping pace

laggy (adj.) – experiencing a delay, especially in computer or network performance

📖 Cultural Story

The word 'lag' originated in the 16th century, primarily used to describe falling behind. Its widespread modern use in computing and technology (e.g., 'internet lag', 'game lag') emerged in the late 20th century with the advent of online networks.