Also found in: Dictionary, Thesaurus, Medical, Encyclopedia, Wikipedia.

damp down

1. To moisten something. A noun or pronoun can be used between "damp" and "down." I have to damp down my hair before combing it, or else it just sticks straight up.
2. To make a fire or flame less intense. A noun or pronoun can be used between "damp" and "down." The room's getting too hot now, so damp down the fire.
See also: damp, down

damp off

To die after overexposure to water. Typically used in reference to plants and seeds. I'm worried that days of torrential rain will cause the flowers I just planted to damp off.
See also: damp, off
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

damp off

[for seedlings] to die from too much water. All the new plants damped off, and we had to buy some from the nursery. The little seedlings damped off and withered away.
See also: damp, off

damp something down

1. Lit. to make something damp. Damp the clothes down before you iron them, Please damp down the clothes first.
2. Fig. to reduce the intensity of a flame, usually by cutting down on the air supply, as with a damper. Please damp the woodstove down. Damp down the air supply or you are going to end up with a raging inferno.
See also: damp, down
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in periodicals archive ?
* Through product design that incorporates mechanical damping features.
Vibration damping thermoplastic elastomers (VDT), also known as energy dissipating TPEs, can significantly reduce vibration when used in place of non-damping elastomer polymer systems.
The group contribution analysis method is used to calculate theoretical TA values and develop a relation between the contribution of each functional group and damping properties.
where [D.sub.i] is the damping percentage of component i, T[A.sub.i] and T[A.sub.c] are the TA value of component i and composite, and T[A.sub.c,0] is the TA value of composite at 0 wt.% content of component i.
where [alpha] is the mass proportional damping coefficient, M is the mass matrix, [beta] is the stiffness proportional damping coefficient, and K is the stiffness matrix.
where [[omega].sub.i] is the circular frequency of mode i; [alpha] is the coefficient to define the mass proportional Rayleigh damping ratio [[xi].sub.[alpha]]; [beta] is used to define the stiffness proportional Rayleigh damping ratio [[xi].sub.[beta]].
Two orders of the reference frequency can be easily and appropriately selected to determine Rayleigh damping coefficients when the degree of freedom of a structure is low or the dynamic response of this structure is controlled by some low-order modes.
(3) Based on the well-known fact that internal and external damping can be transformed to Rayleigh damping, it is shown that the damping coefficients can be effectively determined using proportional damping and two damping coefficients can be reasonably estimated for real systems through a parametric study of damping coefficients in association with flutter loads of Beck's columns.
Figures 4 and 5 are drawn for damping per period versus wavenumber for fast and slow waves for the same set of values of flow, respectively.
A PSS is added with each synchronous generator to provide an additional damping torque if system tempts to become unstable for oscillations.
The damping coefficient is selected so that the vibrational energy it dissipates is equivalent to the energy dissipated in all the damping mechanisms, combined, present in the actual structure.
[G.sub.p](s) and [G.sub.u](s) are respectively the transfer functions in active power and voltage control loops attached with damping controllers, then [[DELTA]V.sub.sp] and [[DELTA]V.sub.su] can be written as (3):