French Phrase
On a besoin d'un rehausseur.
Meaning
The sentence states that a booster seat is needed. It can refer to a car booster for a child, a seat‑raising platform, or any device that raises a person’s height for safety or comfort.
When to use
Use this phrase when talking about child‑safety in a vehicle, when arranging travel with a young child, or when you simply need a seat‑raising device in a public setting.
✦Grammar Breakdown
Onabesoindeunrehausseur.
On (impersonal pronoun)
‘On’ is an indefinite pronoun that can mean ‘we’, ‘people’, or ‘one’ in everyday French.
Avoir besoin de + noun
The verb phrase ‘avoir besoin de’ means ‘to need’; it is always followed by the preposition ‘de’ before a noun.
Elision d' before vowel
‘de’ becomes ‘d’ when the following word starts with a vowel or mute ‘h’, as in ‘d’un’.
Indefinite article ‘un’
‘un’ introduces a singular, masculine noun that is not previously identified.
Noun ‘rehausseur’
‘rehausseur’ is a masculine noun meaning a booster seat, often used for children in cars.
🗨In Conversation
On a besoin d'un rehausseur pour le petit.
We need a booster seat for the little one.
Pas de problème, j'en ai un dans le coffre.
No problem, I have one in the trunk.
✕Common Mistakes
On a besoin un rehausseur.
The preposition ‘de’ is required after ‘besoin’.
On a besoin d' le rehausseur.
‘de le’ contracts to ‘du’, not ‘d' le’. Use ‘du rehausseur’ if the noun is specific.
On a besoin d'une rehausseur.
‘rehausseur’ is masculine; the correct article is ‘un’.
↔Alternatives
Il nous faut un rehausseur.
We need a booster seat.
Nous avons besoin d'un rehausseur.
We need a booster seat.
Il faut un rehausseur.
A booster seat is required.
Cultural Tip
In France, children under 10 years old must be secured in an appropriate child‑car seat. A ‘rehausseur’ is mandatory for kids who have outgrown a rear‑facing seat but are still below 135 cm. Mentioning the need for a rehausseur shows awareness of safety regulations and is common in everyday conversation about family travel.