make sure — free from doubt as to the reliability, character, action, etc., of something: to be sure of one's data.
safeguard — something that serves as a protection or defense or that ensures safety.
guarantee — a promise or assurance, especially one in writing, that something is of specified quality, content, benefit, etc., or that it will perform satisfactorily for a given length of time: a money-back guarantee.
confirm — If something confirms what you believe, suspect, or fear, it shows that it is definitely true.
certify — If someone in an official position certifies something, they officially state that it is true.
warrant — authorization, sanction, or justification.
assure — If you assure someone that something is true or will happen, you tell them that it is definitely true or will definitely happen, often in order to make them less worried.
protect — to defend or guard from attack, invasion, loss, annoyance, insult, etc.; cover or shield from injury or danger.
provide — to make available; furnish: to provide employees with various benefits.
secure — free from or not exposed to danger or harm; safe.
arrange — If you arrange an event or meeting, you make plans for it to happen.
cinch — If you say that something is a cinch, you mean that you think it is very easy to do.
clinch — If you clinch something you are trying to achieve, such as a business deal or victory in a contest, you succeed in obtaining it.
effect — something that is produced by an agency or cause; result; consequence: Exposure to the sun had the effect of toughening his skin.
guard — to keep safe from harm or danger; protect; watch over: to guard the ruler.
okay — to put one's endorsement on or indicate one's approval of (a request, piece of copy, bank check, etc.); authorize; initial: Would you OK my application?
lock up — a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, dial, etc.
nail down — a slender, typically rod-shaped rigid piece of metal, usually in any of numerous standard lengths from a fraction of an inch to several inches and having one end pointed and the other enlarged and flattened, for hammering into or through wood, other building materials, etc., as used in building, in fastening, or in holding separate pieces together.
set out — to put (something or someone) in a particular place: to set a vase on a table.
